If a tracker transmits an 'alert' message, you will now see an alert='true' parameter, as well as an alertType="BUTTON" parameter. The alertType parameter could have any of these values:
The user has pressed the red alert button
The bluetooth connection has been lost
A collision alert
The countdown timer has timed-out
The dead-man timer wasn't reset in time
The tracker has moved too far from it's geofence centre
The user has cancelled any previous alerts (this is a menu option on the tracker).
External power (5V) has been disconnected or re-connected
Temperature outside preset range.
The tracker has transmitted because it crossed a polyfence boundary.
Activity occurred on an external input
RockAIR specific feature - hover detection events
RockAIR specific feature - events for fixed-wing aircraft to represent stopped (on blocks), moving (off-blocks), take-off and landing.
Excessive rate of change of altitude events